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Finding the Fourth Proportional to 998.88, 1,378.54 and 556.88

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Solution

The fourth proportional to 998.88, 1,378.54 and 556.88 is: 768.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.88 : 1,378.54 = 556.88 : x
  2. Step 2: Convert to fraction form
    998.88/1,378.54 = 556.88/x
  3. Step 3: Cross multiply
    998.88x = 1,378.54 × 556.88
  4. Step 4: Simplify right side
    998.88x = 767,681.36
  5. Step 5: Solve for x
    x = 767,681.36/998.88
  6. Step 6: Final answer
    x = 768.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.